Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee788becb862013…

MALICIOUS

PDF

74.3 KB Created: 2021-03-07 19:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d4f2020692d0fc7505eb3e9009be014f SHA-1: 9fb90b4f889a33cdc356095ded1ec172422f09f7 SHA-256: 9ee788becb862013187bd168ce0499beeb3957ab5c8277004aaea64d4a08d2c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. The primary malicious URL identified is vilenefex.ru, which is presented in the context of "how to use saunders nclex book" to deceive the user. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/award?keyword=how+to+use+saunders+nclex+book PDF link annotation
    • https://cdn.sqhk.co/nizekidido/iagfjgs/67736507855.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/jf6OmOU/walevepifilola.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/e3F6JUl/airplane_clipart_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/KSjjXij/line_launcher_prime_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/heghxji/wewukelifaponudujulopiv.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/percy_jackson_and_the_titans_curse_full_movie_in_hindi_download_filmyzilla.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/vodobevaxupijiridakod.pdfIn PDF document text
    • https://cdn.sqhk.co/pejozujemu/iZolVAZ/xejumojetobuwanum.pdfIn PDF document text
    • https://cdn.sqhk.co/walamalesumi/hgOif0H/fishing_life_vest.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/o2JJibP/15881501453.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/hgQhhie/dead_empire_zombie_war_cheat_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/qjhgcjh/wumusutapobemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/how_to_include_public_speaking_on_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/24608368538.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/wafuradif.pdfIn PDF document text
    • http://duvodix.myartsonline.com/clicker_products_klik2_programming_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130a1353-2d84-4306-bd2b-aaf5183603a6/milo_manara_-_the_definitive_collection_humanoids.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/luripa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c10aca-0c2c-44af-9ab3-a5c685aeaa9e/laterevukekulag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf273bd7-7489-411c-9226-99b7c443afd7/epson_artisan_837_ink_cartridge_not_recognized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b9239c-4742-4cca-87f0-d8ece2bc6689/xoragoraf.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/what_is_the_salary_of_a_teacher_in_georgia.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/what_are_the_principles_of_freemasonry.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/the_end_of_the_f_world_season_1_bloopers.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/the_maltese_falcon_full_movie_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 5260 bytes
SHA-256: 4e2682765f5bef16b8655623ead93518f9bb00c9eb8a80f7eec56d12bc5ef0b2
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 10520 bytes
SHA-256: 0a8c05e5f8f0104c07ef5a5c0091f7281f2da29c497da70f76a7dfff6c7ed040